1a larva in June-August => 2

1b larva in March-May => 3

1c galls, etc => Tables for all parasites per species

2a on lesser Epilobium-species; one or more short corridors radiating from the base of the midrib; later mine (may be on another leaf) an elongated blotch beginning at the midrib: Mompha locupletella

2b on Epilobium hirsutum; untidy corridor somewhere on the leaf; later mine a large blotch independent of the midrib: Mompha langiella

3a on lesser Epilobium-species; one or more short corridors radiating from the base of the midrib; later mine an elongated blotch that begins at the midrib: Mompha locupletella

3b on all Epilobium-species; blotch mines only => 4

4a lower-surface blotch, centered over the midrib; little or no frass: Mompha ochraceella

4b full-depth blotch without apparent association with the midrib; much coarse granular frass => 5

5a larva: anal shield light brown, feet dark brown: Mompha propinquella

5b anal shield and feet dark grey: Mompha lacteella